try this
and paste it on your grandchase folder and use bypass
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using bypass
1.make right click the main.exe and click create shortcut
2.right click the shortcut of main.exe and click properties
3.go to target after the \main.exe" (space) and add this __kogstudios_original_service__
or should be like this

if all else fails do these steps:
1. create a back-up copy of the grandchase folder (the less updated the better)
2. use the gc launcher of that back-up
3. monitor the gauge... if the main.exe appears in the patcher look for the main.exe incompleted file in the back-up, if the main.exe disappears even if the bar is full. close the patcher and return to step 2.
4. if the main.exe showed up after the gauge is full then close the patcher and then copy that main.exe and then paste it to your master gc client folder.